Automatic pressure latch



Jan. 24, 1928.

1,657,031 L. M. PAGE ET AL AUTOMATIC PRESSURE LATCH Filed June 11. 19262 Sheets-Sheet 1 I wagons @2435 SL .SM-

THEIR ATTORNEY Jan. 24, 1928.

L. M. PAGE ET AL AUTOMATI C PRESSURE LATCH Filed June 11, 1926 2Sheets-Sheet 2 mm srm 'TH EIRATTORNEY Patented Jan. 24, 1928.

UNITED STATES PATENT OFFICE.

LESLIE M. "PAGE, OF MAPLEWOOTD, JERSEY, AND LOUIS MEYLACH OF BROOKLYN,

NEW. YORK. t

AUTOMATIC tensssunn micron.

' Application filed June 11,

This invention relates to automatic pressure latches and has for itsobject to provide a device ottthe class specified, simple inconstruction andadjustment and efiicient in operation.

To these ends and others which will appear later herein, ourimprovements comprise features illustrated in their preierred embodimentin the drawings accompanying this specification, wherein:

Figure 1 is a rear clevationbf a latch mechanism to which ourimprovements are applied. Fig. 2 is a side elevation correspondingwithFigil. F1gs. 8 and d are elevations similar to that ofFig. 2 showingsteps in the operation'ot the mechanism. Fig. is a side elevation o't adeta l corresponding with Fig. 2 andFlg. 6 1s a similar detailcorresponding with Fig. 8. All the figures of the drawings are to onescale.

Our improvements are particularly directed to 111021119101 latching downunder pressure, a. member, such as pressing arm 2, which may bepivotally supported at its right hand end, Fig. 3, and preferablycounterbalanced at that end. Said pivotal mounting and counterbalanceare omitted, but are ot well known character.

As illustrated in the drawings the mechanism is employed itor clampingdown undor pressure a pile of sheets 3 on stand 4:.

Another application of our improvements,

which we have found particularly useful, is for clamping under pressure,arm or yoke in the hat lining blocking machine set forth in U. S.Letters Patent No. 1,541,997 granted to as June 16, 1925, to which roterence may be had. In the device of that patent, to bring pressure tobear on the work in progress, it is necessary to apply considerable,torce to bring yoke 19 down into position to engage latch 15. This islaborious, particularly when may t mes repeated, as usualin the constantemployment of the machine. To reduce the labor of operation to a minimumis the particular object of the present improvements.

Directing attention now particularly to Figs. 1 and 2 of the drawingsthe mechahis m may be mounted upon table 5,base 6 of the device beingsecured to said tableby some convenient known means not shown. Risingfrom said base are ears 7, 8 and 9 ;in which rockshai't 10 has bearings.Fixed to the lefthand end of shaft 10, Fig. 1,1s

1926. Serial No. 115,174.

operating lever 11, which, when in use may be swung from the position ofFigs. 1 and 2m upward direction to the position of Fig. 1. Foradditional leverage, said'levcr 11 may be provided with handle 12extending outwardly to the right therefrom, Fig. 2. For adjustablylimiting the movement of said lever in anti-clockwise direction, Fig. 3for instance, screw 16, threaded in horn 17 of said lever may impingeagainst baseti, and for adjustahly limitingthe clockwise movement ofsaid lever, screw 18, similarly impinges against another portion of saidbase. i

reely pivoted through its hubs 13, 1 1 on shaft 10 and upstandingtherefrom, is latch carrier 15. Projecting to the righttherefrom, Figs.2 and 3, is arm for engage.-

ment with post 26 of base 6 for limiting the clockwise movement of saidcarrier. 1 Also projecting to the right therefrom, Fig. 1, is car 33 torcooperation with adjustable screw 3 1 in the tree end of arm 35, fixedto the righthand end of shaft 10, for purposes described later herein. 1

tdlidably mounted in said carrier is the latch, indicated in a gcneralWayby L. For convenience of adjustment said latch is made up of twomembers, latch body 19 and latch hook 20. Latch body 19 is free to slideup and down incarrier lo and slidably retained therein by cap plate 21,fixed by screws 22 to saidcarrier. Latch hook L9 lies between ears as 23at the upper end of latch body 19 and is positioned transverselythereby. Bolt 24 is efficient for holding latch 11001: 20 in adjustedrelation with latch body '19. Latch body 19 terminates down \vardly infoot 27 the left hand portion, Fig. ojt which adapted for engaging cam30 therebelow and from the right hand portion depends spring bolt 28.Said. bolt passes downwardly through suitable 0pen ingsin base 6 andtable 5, to adjustable turnbuckle 29 and thence to spring3l, the a lowerend of whichis secured to bar 32 in fixed relation to table 5.

Between ears 7 and 8 of base 6, cam 30 is fixednto shaft 10. Said camhas its" outer face 30 substantially concentric with shaft 10 andtheleft corner 30 is curved downwardly to meet flat side 30,'see Fig. 6.Also as bolt 28 lies within the path ofsaid cam. the mid-portion of thecam is cut away at 36 to clear said bolt, see Fig, 5.

I ll

The operation of our improved latch is as :tollows: In Figs. 1 and 2 thedevice is in operative position for holding down, under the tension ofspring 31, pressing arm 2 against the stack of sheets 3 on stand 4-. Atthat time cam 30 lies horizontally, as in the detail Fig. 5. and foot 27of latch body 1%) stands just clear thereof, whereby the pull of spring31 is exerted through said latch body 19 and latch hook 20, directly onarm 2 to compress the material 3 on stand Tl.

It now, handle 12 be litted from the horizontal position of Figs. 1 and2 to the position of Fig. 3, cam 30 is turned in anti-clockwisedirection from the position of Fig. 5 to that of Fig. 6. whcreliiy latchbody 19 and book 20 are raised against the pull of spring 31 and lever 2is releasei'l from engagen'ient with the material on table -;l. At thisstate at the upward movement of handle 12 the point of screw 31 engagescar 3301 carrier 15 and by a further slight anti-clockwise movement ofsaid handle, screw 3-1: swings carrier 15, latch body 19 and hook 20 tothe leftand lifts arm free of post 2th and stop screw 16 impinges uponbase (3, stopping iturthcr movement all as shown in Fig. elf This lastsmall movement just described swings the latchliook tree 01 pressing arm2 permitting that arm to rise to the dotted position 23, Figs. 3 and 1.It then. handle 12 be released the parts return to the position of Fig.3 but with arm 2 in position 2. tree of the latch book. It now. a newpile of sheets 3 having been placed on stand 1, pressing arm 2 is pulleddownwardly from position 2 to the full line position of Fig. 3, latchhook 20 will be crowded slightly to the left as said arm shutsthereover. nearly to the position of Fig. 4. This will cause foot 27 toride back slightly to the left on cam corner 30" and as latch hook 2Osnaps into place on arm 2 Fig. 3, under the pull of spring 31. foot 27will take cam 30, lever 11 and handle 12 with it to the right until arm25 strikes post 26; Cam is then just passing its position of reposerelative to foot 27 and the impetus given lever 11 and handle 12 bytheir movement to the right is suiticient to cause said l ver and handleto fall. whereby cam 30 passes to the position of Figs. 1, 2 and 5 andspring 2% is Free to exert its pull directly on latch hook 520 to urgepressing arm it against stack 3- on stand 4 as in Fig. 2.

Having thus described the constrlwtiim and operation of our improvedautomatic pressure latch. what we claim is: i

1. In a mechanism of the character described the comhination of a basehaving bearings, a horizontal shaft mounted for oscillation in saidbearings. a latch carrier freely mounted on said shaft, a latch mountedfor vertical sliding movement in said carrier, a cam fixedto said.shaft. a foot on said latch adapted to be engaged by said cam forraising said latch. a downwardly aeting pull spring attached to saidlatch and means for oscillating said slnl'lt for causing the cam topresent its high part to said loot for raising said latch against thepull of said spring.

2. 111 a mechanism of the character de scribed the combimttion ot a basehaving bearings, a horizontal sha'l t mounted tor oscillation in saidbearings, a latch t'tll'l'ltll' freely mounted on said shaft. a latchmounted :for vertical sliding mownucnt in said carrier, a cam fixed tosaid shaft. a foot on said latch adapted to be engaged by said cam forraising said latch a downwardly acting pull spring attached to saidlatch. means for oscillating said shaft for causing the "am to presentits high part to said foot tor raising said latch against the pull ofsaid spring and means operativcly connccted with said shaft oscillatingmeans l'or swinging said latch carrier to move said latch into inoie'ative position.

3). lo a mechanism of the character described the combination ol :1 basehaving bearings, a horizontal shaft mounted for as cillation in saidbcarii'lgs, a latch carrier freely mounted on said shaft, a latchmounted for vertical sliding movement in said carrier, a cam tired tosaid shalt, a foot on said latch adapted to be engaged by said cam forraising said latch a hook on the upper end o1" said latch, a pressingarm adapted to be engaged by said latch book, a downwardly acting pullspring attached to said latch, a lever attached to said shaft forrocking said cam an adjustable stop for limiting the movement ot saidlever in raised position, means for adjusting the distance of said latchbook from said latch foot and means. operatively connected with saidlever. for swinging said latch carrier to disei'igagc said latch hookfrom said pressing arm. said latch disengaging means being operablesuccccih ing the lifting ol' the latch by the cmn.

$1 In a mechanism of the character dcscribed the combination of a basehaving bearings a. lmrizontal shalt mounted tor oscillation in saidbearings, a latch carrier 'lrccly mounted on said shaft, a latch mountedfor vertical sliding movement in said carricn a cam lixed to said shaft,a foot on said latch adapted to he eiigagcd by said cam for raising saidlatch, a hook on the upper end of said latch. a prcssing arm adapted tobe engaged by said latch hook and a downwardly acting pull springattachta'l, to said latch toot remote from the camcngaging portion ofsaid foot. whereby said spring is ellicient tor holding said latch incngageahlc position relatively to said pressingarm.

5. In a mechanism of the character dcscrihed the combination of a basehaving bearing--*, a horizontal shaft mounted for oscillation in saidbearings, a latch carrier freely mounted on said shaft, a latch mountedfor vertical sliding movement in said carrier, a cam fixed to saidshaft, a foot on said latch adapted to be engaged by said cam forraising said latch, a hook on the upper end of said latch, a'pressin armadapted to be engaged by said latch 100k, a downwardly acting pullspring attached to said latch foot 1'611'10t0'f1011'1 the cam-engagingportion of said foot, a lever attached to said shaft for rocking saidcam, an adjustable stop for limiting the movement of said lever inraised position, a stop for limiting the movement of said latch carrierwhen said latch is in engaging relation with said pressing arm, meansfor adjusting the distance of said latch hook from said latch foot andmeans, operatively connected with said lever, for swinging said latchcarrier to disengage said latch hook from said pressing arm, said latchdisengaging means being operable succeeding the lifting of the latch bythe cam.

6. In a mechanism of the character described the combination of a basehaving bearings, a horizontal shaft mounted for oscillation in saidbearings, a latch carrier freely mounted on said shaft, a latchmountacting pull spring attached to said latch foot remote from thecam-engaging portion of said foot, whereby said spring is eflicient forholding said latch in engageable POSltlOIl relatively to said pressingarm, a lever at tached to said shaft for rocking said cam, an adjustablestop for limiting the movement of said lever in raised position, a stopfor limiting the movement of said latch carrier when said latch is inengaging relation with said pressing arm, means for adjusting thedistance of said latch hook from said latch foot and means, operativelyconnected with said lever, for swinging said latch carrier to disengagesaid latch hook from said pressing arm, said latch disengaging meansbeing operable succeeding the lifting of the latch by the cam.

In witness whereof we hereby afiix our signatures this 10 day of June,1926.

LESLIE M. PAGE. LOUIS MEYLACH.

